Just to set some facts right about the Manchester Eiruv. R’ Osher Westheim wrote a letter stating one should NOT use it at the moment. An eiruv can be made by the best Poskim in the world, but if there is not the correct poskim in place to check it on a weekly basis and to take responsibility for it then it is not worth anything!
R Osher said he was makabel from his Rebbes (Dayan Weiss mainly) that you can make an eiruv in Manchester, but since it does go over the main roads Bury New and Bury Old, then he said he would imagine most Heimishe people would want to be machmir. He said this before he came out with the letter that nobody should use it.
Besides for this, there are Rabbonim who hold that Bury New Road may be a reshus horabim de’oraise as it services the whole of Manchester and Thousends of people use it every day.